Question

A 10-cm-long thin glass rod uniformly charged to 7.00nC and a 10-cm-long thin plastic rod uniformly charged to - 7.00nC are placed side by side, 4.50cm apart. What are the electric field strengths E1 to E3 at distances 1.0 cm, 2.0 cm, and 3.0 cm from the glass rod along the line connecting the midpoints of the two rods?